set terminal eps
set output "integration_demon.eps"
set xtics ("a" 2, "b" 3) font "Arial,20"
unset ytics
unset key
set label "f(x)" at 2.5,16 font "Arial,20"
plot [1.5:3.5] exp(x) with line lw 6, [2:3] exp(x)-0.3 with filledcurves x1 fc "cyan" lw 5 lc rgb "blue" 
